A document can contain only one signature field that contains a DocMDP transform method, and it must be the first signed field in the document. That signature is called a “certification” signature. This feature enables the author to specify what changes are permitted and what changes invalidate the author’s signature. However, most users will perceive the effect of DocMDP as specifying what they can do to a document.

As far you are not the first signer of the pdf, you can not do better.

What can I say, that's the key point of Acrobat. I tried to combine that with GDP as well, but I barely could count all the times it let me down. No I'm done with Adobe's thing for good, but you may consider to try to keep modifying your files and to fix the signature issue then? Yes, quite a solution, but either way, it's better than nothing. Or you should try some other tool instead of Acrobat XI, actually me using this one: https://edit-pdf.pdffiller.com/ It allows to do all the required edits with pdf's, such as to replace fonts, add watermark or signatures, obviously. Furthermore, this one is free and works as web application fine, so all you need here is up-to-dated browser version. Haven't tried to compare it with gdpicture yet, but don't think of it as anything challenging

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About ORPALIS

ORPALIS produces document imaging software for developers and general public. ORPALIS maintains the comprehensive document imaging toolkit series released under the brand "GdPicture", which is now a worldwide known and respected leader in imaging technologies...more